Image display apparatus and method of controlling the same
In an image display apparatus, when image data is transferred from an LCD controller to an LCD through a transmission cable having a plurality of signal lines and is displayed on a screen, the image data is divided sequentially by a plurality of lines from a front line so as to correspond to the number of signal lines and allocates the divided image data to the signal lines such that image data of which signal change is larger is allocated to a signal line which is closer to the ground line to transfer the image data. Therefore, the entire radiation noise which is generated can be reduced while maintaining quality of signals.
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1. Technical Field
The present invention relates to an image display apparatus and a program. The image display apparatus includes a display unit and a controller connected to the display unit through a plurality of signal lines and a ground line. In the image display apparatus, an image signal is transferred from the controller to the display unit through the plurality of signal lines so that an image is displayed.
2. Related Art
An existing device in which a main control plate on which a CPU is mounted and a print head control plate which controls a head driver are connected to each other through a transmission cable, and when a signal such as image data is transmitted between the two control plates, a signal voltage is lowered and the signal is output to the transmission cable has been proposed (for example, see JP-A-2001-134356). In the control circuit, a signal of 5V as an internal voltage of the control plate is lowered to 3.3 V so as to reduce power of the signal itself. This makes it possible to suppress radiation noise and induction noise from being generated.
However, in the above device, although noise can be suppressed from being generated, power of the signal itself is reduced. Therefore, signal quality is deteriorated and reliability of signal transmission is deteriorated in some case.
SUMMARYAn advantage of some aspects of the invention is to provide an image display apparatus and a program which suppress noise from being generated when an image signal is transferred through a signal line while maintaining signal quality.
An image display apparatus and a program according to aspects of the invention employ the following apparatuses and methods in order to obtain the above advantage.
An image display apparatus according to an aspect of the invention includes a display unit and a controller connected to the display unit through a plurality of signal lines and a ground line, and displays an image by transferring an image signal from the controller to the display unit through the plurality of signal lines. The image display apparatus includes a transmission unit which is provided at the side of the controller with respect to the signal lines, divides the image signal into up to the number of signal lines in a predetermined order to analyze the divided image signals, and allocates the analyzed image signals to the signal lines such that an image signal of which signal change is larger among the analyzed image signals is allocated to a signal line which is closer to the ground line to transfer the image signals together with correspondence relationship between the image signals and the allocated signal lines to the side of the display unit, and a reception unit which is provided at the side of the display unit with respect to the signal lines inputs the image signals and the correspondence relationship from the transmission unit, restores the input image signals to an original order using the input correspondence relationship to output the image signals to the display unit.
The image display apparatus according to the aspect of the invention includes the display unit and the controller which are connected to each other through the plurality of signal lines and the ground line. In the image display apparatus, an image signal is transferred from the controller to the display unit through the plurality of signal lines so as to display an image. Further, in the image display apparatus, the transmission unit which is provided at the side of the controller with respect to the signal lines sequentially divides the image signal into up to the number of signal lines to analyze the divided image signals, and allocates the analyzed image signals to the signal lines such that an image signal of which signal change is larger among the analyzed image signals is allocated to a signal line which is closer to the ground line to transfer the image signals together with correspondence relationship between the image signals and the allocated signal lines to the side of the display unit. The reception unit which is provided at the side of the display unit with respect to the signal lines inputs the image signals and the correspondence relationship from the transmission unit, and restores the input image signals to an original order using the input correspondence relationship to output the image signals to the display unit. With this, when an image signal is transferred using the plurality of signal lines, a noise level can be reduced while maintaining quality of the image signals.
In the image display apparatus according to the aspect of the invention, it is preferable that the transmission unit be a transmitting unit to calculate the ratio of ON signals in one cycle of each of the image signals and allocate the image signals to the signal lines such that an image signal of which calculated ratio is larger is allocated to a signal line which is closer to the ground line to transfer the image signals. With this, through the simple calculation, a signal of which change is larger among image signals can be specified.
Further, in the image display apparatus according to the aspect of the invention, it is preferable that the transmission unit be a transmitting unit to transfer the correspondence relationship before each of the image signals is transferred. With this, the reception unit can smoothly output the received image signals to the display unit.
Further, in the image display apparatus according to the aspect of the invention, it is preferable that the transmission unit be a transmitting unit to divide the image signals on a line basis, and allocate the divided image signals to the plurality of signal lines to transfer the image signals to the reception unit.
In a method of transferring an image signal from a controller to a display unit through a plurality of signal lines according to another aspect of the invention, the display unit and the controller are electrically connected to each other through a ground line and the plurality of signal lines, and an image signal of which signal change is the largest among image signals which are simultaneously transmitted through the signal lines is transferred through a signal line which is the closest to the ground line. With this, when an image signal is transferred by using a plurality of signal lines, a noise level can be reduced while maintaining quality of the image signals.
The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements.
Hereinafter, an embodiment of the invention is described with reference to the drawings.
The printer 20 according to the embodiment is configured as a photo printer in which a printing mechanism 40 (see,
The printing mechanism 40 includes a carriage 41, ink cartridges 44, a print head 45, and a transportation roller 46 as illustrated in
The LCD 25 receives display control by the LCD controller 60 so as to display characters, figures, symbols, and the like. In the embodiment, the LCD 25 is formed by pixels of 960 dots×240 dots. Image data of 960 dots forms one line and line data of 240 lines forms one frame (one image).
Further, the printer 20 according to the embodiment includes a main controller 50, a printer ASIC 48, an infrared communication controller 56, the LCD controller 60, and a memory card controller 58 as a control system as illustrated in
The main controller 50 is configured as a microprocessor centered on a CPU 51 and includes a ROM 52, a RAM 53, a flush memory 54, and an interface (I/F) 55. The ROM 52 stores various processing programs, various data, various tables, and the like. The RAM 53 temporarily stores data. Data in the flush memory 54 can be electrically rewritable and held even when the power is turned OFF. The interface (I/F) 55 inputs an operation signal from the power button 26. The main controller 50 inputs an image file and the like from the memory card MC inserted into the memory card slot 57 and inputs an operation signal from the infrared communication controller 56, an detection signal from each part of the printing mechanism 40, and the like. Further, the main controller 50 stores editing images and the like in the memory card MC and outputs a direction signal to the printer ASIC 48 and a control signal to the LCD controller.
The LCD controller 60 inputs image data (RGB data) for one frame from the main controller 50 and stores the image data in an SDRAM 62 as a VRAM. If a vertical synchronization signal VSYNC is output from a synchronization signal generation unit (not shown), the LCD controller 60 reads out the image data for one frame sequentially from a front line. Further, every time the horizontal synchronization signal HSYNC is output, the LCD controller 60 reads out image data for four lines so as to output the image data to the transmission unit 70. The transmission unit 70 which has been input the image data for four lines allocates the input image data for four lines to four signal lines D0 to D3, respectively, while rearranging the order of the image data on the line basis. Further, the transmission unit 70 simultaneously transfers the image data for four lines to the reception unit 80. If the reception unit 80 receives image data for four lines from the transmission unit 70, the reception unit 80 restores the order of the image data to an original order and sequentially outputs the image data to the LCD 25 so as to display an image on the LCD 25. A case in which the order of the image data is rearranged and is transferred is described in detail later.
Next, operations of the printer 20 according to the embodiment as described above, in particular, operations of the transmission unit 70 and the reception unit 80 are described. At first, the operations of the transmission unit 70 are described.
Next, correspondences between components according to the embodiment and components according to the invention are made obvious. The liquid crystal display (LCD) 25 according to the embodiment corresponds to a “display unit” according to the invention, the LCD controller 60 corresponds to a “controller”, the transmission unit 70 corresponds to a “transmission unit”, and the reception unit 80 corresponds to a “reception unit”.
According to the printer 20 in the above-described embodiment, when the image data is transferred from the LCD controller 60 to the LCD 25 through the transmission cable 90 and displays an image on a screen, the image data is input sequentially from the front line by a plurality of lines so as to correspond to the number of the signal lines D0 to D3 of the transmission cable 90. Then, a P/T value of the image data on each input line is calculated to set the calculated P/T value as an allocation judgment value P/T. Further, image data of which allocation judgment value P/T is large is allocated to a signal line of which loop area between the signal line and the ground line GND among the signal lines D0 to D3 is smaller so as to be transferred. Therefore, the entire radiation noise which is generated can be reduced while maintaining quality of signals. In addition, the transmission unit 70 transmits an order direction signal for notifying of a line rearrangement order before the image data is transferred. Therefore, the reception unit 80 can previously set connection relationship between the signal lines D0 to D3 and the line buffers 84a to 84d by the selectors 84a to 84d. Accordingly, the order of the lines of the image data can be restored to an original order only by inputting the image data from the signal lines D0 to D3. Further, the P/T value is calculated by measuring NO1 as the number of signals of 1 within the data input from the input lines IN0 to IN3 and dividing the measured NO1 as the number of signals of 1 by the total number of data NOA. Therefore, the P/T value can be derived with a simple processing.
In the above embodiment, a P/T value is calculated every time the image data is input and the image data input is allocated to either of the plurality of signal lines D0 to D3 in accordance with the calculated P/T value. However, the invention is not limited thereto and a P/T value which has been calculated in the past may be used for allocation of subsequent image data.
In the above embodiment, the image data is allocated to the signal lines D0 to D3 on the line basis and transferred to the side of the LCD 25. However, the invention is not limited thereto and the image data may be allocated based on any unit. For example, the data may be allocated on a single frame basis and transferred.
In the above embodiment, image data is allocated to the four signal lines D0 to D3 and simultaneously transferred. However, the invention is not limited thereto and the number of signal lines may be arbitrarily set as long as equal to or more than two signal lines having different loop areas formed between the signal lines and the ground lines are provided.
In the above embodiment, the invention is applied to the printer 20 including the liquid crystal display 25. However, the invention is not limited thereto and may be applied to any devices such as a facsimile machine, a viewer, and a personal computer, for example, as long as the device includes a display. Further, the display is also not limited to the liquid crystal display and may be applied to any displays configured by a plurality of pixels, such as a plasma display or an organic EL display.
It is to be noted that the invention is not limited to the above embodiment and can be carried out in various modes as long as the modes are in the technical range of the invention.
The present invention contains subject matter related to Japanese Patent Application No. 2010-097607 filed in the Japanese Patent Office on Apr. 21, 2010, the entire contents of which are incorporated herein by reference.
Claims
1. An image display apparatus which includes a display unit and a controller connected to the display unit through a plurality of signal lines and a ground line, and displays an image by transferring an image signal from the controller to the display unit through the plurality of signal lines, comprising:
- a transmission unit which is provided at the side of the controller with respect to the signal lines, divides the image signal into up to the number of signal lines in a predetermined order to analyze the divided image signals, and allocates the analyzed image signals to the signal lines such that an image signal of which signal change is larger among the analyzed image signals is allocated to a signal line which is closer to the ground line to transfer the image signals together with correspondence relationship between the image signals and the allocated signal lines to the side of the display unit; and
- a reception unit which is provided at the side of the display unit with respect to the signal lines inputs the image signals and the correspondence relationship from the transmission unit, restores the input image signals to an original order using the input correspondence relationship to output the image signals to the display unit.
2. The image display apparatus according to claim 1,
- wherein the transmission unit is a transmitting unit to calculate a ratio of ON signals in one cycle of each of the image signals and allocate the image signals to the signal lines such that an image signal of which calculated ratio is larger is allocated to a signal line which is closer to the ground line to transfer the image signals.
3. The image display apparatus according to claim 1,
- wherein the transmission unit is a transmitting unit to transfer the correspondence relationship before each of the image signals is transferred.
4. The image display apparatus according to claim 1,
- wherein the transmission unit is a transmitting unit to divide the image signal on a line basis, and allocate the divided image signals to the plurality of signal lines to transfer the image signals to the reception unit.
5. A method of transferring an image signal from a controller to a display unit through a plurality of signal lines, and the display unit and the controller are electrically connected to each other through a ground line and the plurality of signal lines, comprising the steps of:
- transferring an image signal of which signal change is the largest among image signals which are simultaneously transmitted through the signal lines through a signal line which is the closest to the ground line;
- dividing the image signal into up to the number of signal lines in a predetermined order;
- analyzing the divided image signals and detecting the number of times of signal change in each of the image signals;
- allocating the image signals to the signal lines such that an image signal of which signal change is larger is allocated to a signal line which is closer to the ground line;
- transferring correspondence relationship between the image signals and the allocated signal lines together with each of the image signals; and
- restoring the divided image signals to an original order using the correspondence relationship,
- wherein the steps are executed by a processor.
6. The method according to claim 5, further comprising:
- calculating a ratio of ON signals in one cycle of each of the image signals; and
- allocating the image signals to the signal lines such that an image signal of which calculated ratio is larger is allocated to a signal line which is closer to the ground line and transferring the image signals.
7. The method according to claim 5, further comprising:
- transferring the correspondence relationship before each of the image signals is transferred.
8. The method according to claim 5, further comprising: dividing the image signals on a line basis, and allocating the divided image signals to the plurality of signal lines and transferring the allocated image signals.
2001-134356 | May 2001 | JP |
Type: Grant
Filed: Apr 20, 2011
Date of Patent: Jan 28, 2014
Patent Publication Number: 20110261406
Assignee: Seiko Epson Corporation (Tokyo)
Inventor: Michio Yoshitake (Onga-cho)
Primary Examiner: Vu B Hang
Application Number: 13/091,069
International Classification: G06F 3/12 (20060101);